Is Ghostbusters 3 Back On? Starring Jonah Hill & Kristen Bell?

Kristen Bell and Jonah Hill just few days ago lit a fire under Ghostbusters 3 rumor mill when they both posted images of the Ecto-1 and cryptic messages to boot. Last we heard Bill Murray had shredded the script and Dan Aykroyd wasn't gonna give up on the project even if he couldn't get Murray back as Peter Venkman. While Bell and Jonah are no strangers they have appeared in two movies, but only had brief scenes together in Forgetting Sarah Marshall. She also had a small cameo in Get Him to the Greek where she made a brief cameo as Sarah Marshall.